| Standard label: | Policyholder Benefits and Claims Incurred, Net, Financial Guarantee |
| Name: | us-gaap:IncurredClaimsFinancialGuaranteeInsuranceContracts |
| Documentation: | Amount, after policies assumed or ceded, of provision for policy benefits and costs incurred for financial guarantee insurance contracts. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:IncurredClaimsFinancialGuaranteeInsuranceContracts |
| Label | Role | Language |
| Policyholder Benefits and Claims Incurred, Net, Financial Guarantee | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 20 50 7 | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |
| FASB Accounting Standards Codification 944 220 S99 1 (SX 210.7-04.5) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |